Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9ef79e298b6e18…

MALICIOUS

PDF

46.3 KB Created: 2021-05-16 01:40:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 5a3b67be0766f13b2357670c6e108fe9 SHA-1: fd723c5e0f2664613eee8ce96dec27ace6fc631f SHA-256: fc9ef79e298b6e186fae0438e210c477bce895b5a6fd9c1d07f42bd3acde1efd
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9278

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/406889139/coin-master-hack-lost-world-2021-game-hack PDF link annotation
    • https://loba.com.vn/public/upload/files/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-robux-now_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/blogger-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-get-minecraft-dungeons-for-free_GM479516143.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-get-free-spins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-2021-robux_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/como-hackear-el-juego-coin-master_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-ultra-attack-hack_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-robux-gen_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-hack-download-2021_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049f2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49F2 27676 bytes
SHA-256: 41f69b57d1f88a85efcad2e6d54273c2f93a5bf2d3cfb5f1cce7f1d8088ff221
font_01_sfnt_off000087ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87AB 2812 bytes
SHA-256: fc92a80cefddbcc51cb4ecd7284aa73b746cbd66adcf1d96110f0323ec06b51f
font_02_sfnt_off0000914c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x914C 18564 bytes
SHA-256: fe6e96bee4f2349a2275eb1baf9951ec67b0217a441ba60f2b7a82c0a0005a9a

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